68 µH wirewound inductor, 170 mA DC, AEC-Q200 qualified
The Murata LQH43NH680J03L is a 68 µH unshielded wirewound inductor in the LQH43 series, rated for 170 mA continuous DC current with a maximum DC resistance of 1.824 Ohm. The 1812 (4532 Metric) surface-mount package is the standard footprint for this inductance range in power and signal filtering.
DC bias and AC loss — what the ratings mean for the filter or choke design
The 170 mA current rating is the DC bias current at which the inductance typically drops by 10% from the nominal 68 µH value. Above this current the core begins to saturate and the inductance falls off — the designer should budget headroom for the peak current in the application, not just the average. The 1.824 Ohm max DCR produces a DC conduction loss of about 53 mW at the rated current (I²R). This self-heating adds to the ambient temperature and must stay within the 125°C ceiling. The Q of 35 at 1 MHz indicates moderate AC losses in the resonant or switching-frequency band; the self-resonant frequency of 8.4 MHz is the upper limit before the part behaves capacitively. Unshielded construction means the magnetic field radiates from the core. Adjacent traces carrying sensitive analog signals or high-impedance nodes should be kept at least one package width away to avoid inductive coupling.
The 1812 footprint and ±5% tolerance are standard for the LQH43 family. No pin-compatible second-source or direct cross-reference is listed; the base product number LQH43NH identifies the series for parametric search.